CN113653467A - Method for cleaning paraffin based on carbon dioxide/nitrogen switch - Google Patents
Method for cleaning paraffin based on carbon dioxide/nitrogen switch Download PDFInfo
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- CN113653467A CN113653467A CN202110961283.6A CN202110961283A CN113653467A CN 113653467 A CN113653467 A CN 113653467A CN 202110961283 A CN202110961283 A CN 202110961283A CN 113653467 A CN113653467 A CN 113653467A
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- solvent
- paraffin
- carbon dioxide
- mixed solution
- nitrogen
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- 239000012188 paraffin wax Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000004140 cleaning Methods 0.000 title claims abstract description 28
- 229940026110 carbon dioxide / nitrogen Drugs 0.000 title claims abstract description 27
- 239000002904 solvent Substances 0.000 claims abstract description 100
- 239000011259 mixed solution Substances 0.000 claims abstract description 35
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 12
- JQVDAXLFBXTEQA-UHFFFAOYSA-N dibutylamine Chemical compound CCCCNCCCC JQVDAXLFBXTEQA-UHFFFAOYSA-N 0.000 claims description 46
- WEHWNAOGRSTTBQ-UHFFFAOYSA-N dipropylamine Chemical compound CCCNCCC WEHWNAOGRSTTBQ-UHFFFAOYSA-N 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 15
- QHCCDDQKNUYGNC-UHFFFAOYSA-N n-ethylbutan-1-amine Chemical compound CCCCNCC QHCCDDQKNUYGNC-UHFFFAOYSA-N 0.000 claims description 13
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 10
- 239000001569 carbon dioxide Substances 0.000 abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 10
- 239000001993 wax Substances 0.000 description 10
- 238000011084 recovery Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 239000003129 oil well Substances 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 230000008021 deposition Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
Abstract
The invention discloses a method for cleaning paraffin based on a carbon dioxide/nitrogen switch, which comprises the following steps: adding a first solvent to dissolve paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent and paraffin; introducing gaseous N into the second solvent2Obtaining a first solvent; the paraffin is dissolved by the first solvent to drop from the pipeline, then carbon dioxide is introduced, the carbon dioxide and the first solvent react to generate a second solvent, the second solvent is incompatible with the paraffin, so that the second solvent and the paraffin are separated, the second solvent is continuously separated to obtain the second solvent, nitrogen is added into the second solvent, and the nitrogen and the second solvent react to obtain the first solvent; realizes the recycling of the solvent, can realize the removal of the paraffin without water, and savesWater resources, only nitrogen and carbon dioxide are used, so that environmental pollution is avoided.
Description
Technical Field
The invention belongs to the technical field of oilfield chemical engineering, and particularly relates to a method for cleaning paraffin based on a carbon dioxide/nitrogen switch.
Background
The wax deposition of an oil well is a phenomenon commonly existing in the development of the oil field, particularly, the wax content is high in the process of thick oil exploitation, the wax contained in crude oil is gradually separated out along with the reduction of pressure and temperature in the exploitation process, the paraffin deposited in an oil well pipe column and a ground oil collecting pipeline can cause the reduction and even blockage of the effective sectional area of the pipeline, the pump efficiency is reduced, the liquid production amount of the oil well is reduced, a sucker rod can be broken due to overload (the ascending load and the descending resistance are increased), the back pressure of the oil well is increased, and the problems that the power consumption of the oil pumping unit is increased, the failure rate is increased and the like are caused. The problem of paraffin deposition is an important problem in the process of oil exploitation and gathering and transportation.
The economic losses due to paraffin deposition and the costs for paraffin deposition control are as high as billions of dollars each year around the world. In order to ensure the smooth operation of crude oil extraction and gathering, wax removal and prevention are needed for wax deposition oil wells and conveying pipelines; most of the existing methods are chemical methods or tools for paraffin removal and prevention of oil wells and conveying pipelines, and the existing methods are widely applied to oil fields. The tool is inconvenient to use, particularly for the conveying pipeline, the conveying pipeline has different sizes, so that the tool with different sizes is required to be prepared for use; and the solvent recovery in the chemical method is difficult.
Disclosure of Invention
In order to achieve the purpose, the invention adopts the following technical scheme: a method for cleaning paraffin based on a carbon dioxide/nitrogen switch comprises the following steps:
adding a first solvent to dissolve paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent and paraffin; introducing gaseous N into the second solvent2And obtaining the first solvent.
Further, the first solvent is one of N-ethylbutylamine, di-N-butylamine and di-N-propylamine, and N-ethylbutylamine is preferred.
Further, when the first solvent is di-n-butylamine or di-n-propylamine, the temperature during the whole process is 25 to 45 ℃.
Further defined, when the first solvent is di-n-butylamine or di-n-propylamine, CO2And N2The flow rates of (A) and (B) are all 100-300 ml/min.
Has the advantages that: the paraffin is dissolved by the first solvent to drop from the pipeline, then carbon dioxide is introduced, the carbon dioxide and the first solvent react to generate a second solvent, the second solvent is incompatible with the paraffin, so that the second solvent and the paraffin are separated, the second solvent is continuously separated to obtain the second solvent, nitrogen is added into the second solvent, and the nitrogen and the second solvent react to obtain the first solvent; the solvent is recycled, the paraffin can be removed without water, the operation is convenient, specific paraffin removal equipment is not needed, water resources and equipment investment cost are saved, and only nitrogen and carbon dioxide are used, so that environmental pollution is avoided; the method for cleaning paraffin based on the carbon dioxide/nitrogen switch can be used for cleaning the paraffin deposited in oil and gas fields, oil and gas transmission pipelines and related equipment.
Drawings
FIG. 1 is a schematic flow diagram of a method for cleaning paraffin on a carbon dioxide/nitrogen switch;
FIG. 2 is a graph of wax recovery versus time for example 1;
FIG. 3 is a graph of wax recovery versus time for example 2;
FIG. 4 is a graph of wax recovery versus time for example 3;
FIG. 5 is a graph showing the results of examples 4 to 6;
FIG. 6 is a graph showing the results of examples 7 to 9;
FIG. 7 is a graph of aeration rate results for examples 10-12;
FIG. 8 is a graph of temperature results for examples 12-14.
Detailed Description
As shown in fig. 1, a method for cleaning paraffin based on carbon dioxide/nitrogen switch comprises the following steps:
adding a first solvent to dissolve paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent and paraffin; first solvent with CO2Reacting to obtain a second solvent, separating to obtain the second solvent, introducing gaseous N into the second solvent2A second solvent with N2The first solvent is generated through reaction, and the first solvent is recycled; the first solvent is one of N-ethylbutylamine, di-N-butylamine and di-N-propylamine, preferably the dissolving rate of paraffin in the N-ethylbutylamine, the di-N-butylamine and the di-N-propylamine meets the industry requirement standard of the paraffin remover (0.016g/min, SY-T6300-2009), wherein the dissolving rates of the 54# and 58# paraffin in the three kinds of paraffin are shown in Table 1.
Table 1 dissolution rate of paraffin wax in a first solvent
| 54# Paraffin wax | 58# Paraffin wax | |
| Di-n-propylamine | 0.068g/min | 0.061g/min |
| Di-n-butylamine | 0.051g/min | 0.037g/min |
| N-ethyl butylamine | 0.054g/min | 0.061g/min |
When the first solvent is di-n-butylamine or di-n-propylamine, the temperature in the whole process is 25-45 ℃; when the first solvent is di-n-butylamine or di-n-propylamine, CO2And N2The introduction rate is 100-300 ml/min; the method can be applied to cleaning the paraffin deposited in oil and gas fields, oil and gas transmission pipelines and related equipment; wherein the first solvent is in a low polarity state when it is in contact with CO2The second solvent generated after the reaction is in a high-polarity state, so that the green cyclic utilization of the solvent is realized.
Example 1
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding N-ethyl butylamine to dissolve 54# paraffin to obtain mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 1 and paraffin; introducing gaseous N into the second solvent 12Second solvent 1 with N2The N-ethyl butylamine is generated by reaction, the temperature is 25 ℃ in the whole process, and CO is generated2And N2The speed of (2) is 300 ml/min; as shown in fig. 2, it is understood from fig. 1 that the recovery rate of wax is close to 70% at 10 minutes, and the increase rate is rapid, and the recovery rate reaches 90% or more at 1 hour, indicating that the wax removal effect is significant.
Example 2
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding N-ethyl butylamine to dissolve 54# paraffin to obtain mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 1 and paraffin; introducing gaseous N into the second solvent 12Second solvent 1 with N2The N-ethyl butylamine is generated by reaction, the temperature is 35 ℃ in the whole process, and CO is generated2And N2The rates of (A) and (B) were all 100ml/min, and the results are shown in FIG. 3.
Example 3
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding N-ethyl butylamine to dissolve 54# paraffin to obtain mixed solution, adding into the mixed solutionIntroducing gaseous CO2And separating to obtain a second solvent 1 and paraffin; introducing gaseous N into the second solvent 12Second solvent 1 with N2The N-ethyl butylamine is generated by reaction, the temperature is 45 ℃ in the whole process, and CO is generated2And N2The rates of (A) and (B) were all 200ml/min, and the results are shown in FIG. 4.
Example 4
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding di-n-butylamine to dissolve 54# paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 2 and paraffin; introducing gaseous N into the second solvent 22Second solvent 2 with N2The reaction is carried out to generate di-n-butylamine at the temperature of 25 ℃ in the whole process, and CO is generated2And N2The rates of (A) and (B) were all 300ml/min, and the results are shown in FIG. 5.
Example 5
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding di-n-butylamine to dissolve 54# paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 2 and paraffin; introducing gaseous N into the second solvent 22Second solvent 2 with N2The reaction is carried out to generate di-n-butylamine, the temperature is 35 ℃ in the whole process, and CO is generated2And N2The rates of (A) and (B) were all 300ml/min, and the results are shown in FIG. 5.
Example 6
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding di-n-butylamine to dissolve 54# paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 2 and paraffin; introducing gaseous N into the second solvent 22Second solvent 2 with N2The reaction is carried out to generate di-n-butylamine, the temperature is 45 ℃ in the whole process, and CO is generated2And N2The rates of (A) and (B) were all 300ml/min, and the results are shown in FIG. 5.
Example 7
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding di-n-butylamine to dissolve 54# paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 2 and paraffin; introducing gaseous N into the second solvent 22Second solvent 2 with N2The reaction is carried out to generate di-n-butylamine, the temperature is 45 ℃ in the whole process, and CO is generated2And N2The rates of (A) and (B) were all 300ml/min, and the results are shown in FIG. 6.
Example 8
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding di-n-butylamine to dissolve 54# paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 2 and paraffin; introducing gaseous N into the second solvent 22Second solvent 2 with N2The reaction is carried out to generate di-n-butylamine, the temperature is 45 ℃ in the whole process, and CO is generated2And N2The rates of (A) and (B) were all 200ml/min, and the results are shown in FIG. 6.
Example 9
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding di-n-butylamine to dissolve 54# paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 2 and paraffin; introducing gaseous N into the second solvent 22Second solvent 2 with N2The reaction is carried out to generate di-n-butylamine, the temperature is 45 ℃ in the whole process, and CO is generated2And N2The rates of (A) and (B) were all 100ml/m, and the results are shown in FIG. 6.
Example 10
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding di-n-propylamine to dissolve 54# paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 3 and paraffin; feeding gaseous N into the second solvent 32Second solvent 3 with N2Reacting to generate di-n-propylamine, wherein the temperature is 45 ℃ and CO is generated in the whole process2And N2All rates of (2) were 100ml/min, as a resultAs shown in fig. 7.
Example 11
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding di-n-propylamine to dissolve 54# paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 3 and paraffin; feeding gaseous N into the second solvent 32Second solvent 3 with N2Reacting to generate di-n-propylamine, wherein the temperature is 45 ℃ and CO is generated in the whole process2And N2The rates of (A) and (B) were all 200ml/min, and the results are shown in FIG. 7.
Example 12
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding di-n-propylamine to dissolve 54# paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 3 and paraffin; feeding gaseous N into the second solvent 32Second solvent 3 with N2Reacting to generate di-n-propylamine, wherein the temperature is 45 ℃ and CO is generated in the whole process2And N2The rates of (A) and (B) were all 300ml/min, and the results are shown in FIG. 8.
Example 13
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding di-n-propylamine to dissolve 54# paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 3 and paraffin; feeding gaseous N into the second solvent 32Second solvent 3 with N2Reacting to generate di-n-propylamine, wherein the temperature is 35 ℃ and CO is generated in the whole process2And N2The rates of (A) and (B) were all 300ml/min, and the results are shown in FIG. 8.
Example 14
The method for cleaning paraffin based on the carbon dioxide/nitrogen switch comprises the following steps:
adding di-n-propylamine to dissolve 54# paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent 3 and paraffin; feeding gaseous N into the second solvent 32A second solvent 3 withN2Reacting to generate di-n-propylamine, wherein the temperature is 25 ℃ and CO is generated in the whole process2And N2The rates of (A) and (B) were all 300ml/min, and the results are shown in FIG. 8.
From the above, the paraffin separation process is mainly controlled by the factors of temperature and gas velocity, and the influence of the gas velocity is most significant, so that the lowest recovery rate is achieved at the gas velocity of 100ml/min and the highest recovery rate is achieved at 300ml/min in the same time.
Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for cleaning paraffin based on a carbon dioxide/nitrogen switch is characterized by comprising the following steps:
adding a first solvent to dissolve paraffin to obtain a mixed solution, and introducing gaseous CO into the mixed solution2And separating to obtain a second solvent and paraffin; introducing gaseous N into the second solvent2And obtaining the first solvent.
2. The carbon dioxide/nitrogen switch-based paraffin wax cleaning method according to claim 2, wherein the first solvent is one of N-ethylbutylamine, di-N-butylamine, and di-N-propylamine.
3. The method for carbon dioxide/nitrogen switch-on and switch-off paraffin wax as claimed in claim 2, wherein when the first solvent is di-n-butylamine or di-n-propylamine, the temperature during the whole process is 25-45 ℃.
4. The carbon dioxide/nitrogen-based on-off paraffin wax cleaning method according to claim 2, wherein when the first solvent is di-n-butylamine or di-n-propylamine, CO2And N2The flow rates of (A) and (B) are all 100-300 ml/min.
5. The carbon dioxide/nitrogen switch-based paraffin wax cleaning method according to claim 2, wherein the first solvent is N-ethyl butylamine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110961283.6A CN113653467A (en) | 2021-08-20 | 2021-08-20 | Method for cleaning paraffin based on carbon dioxide/nitrogen switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110961283.6A CN113653467A (en) | 2021-08-20 | 2021-08-20 | Method for cleaning paraffin based on carbon dioxide/nitrogen switch |
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|---|---|---|---|---|
| CN101641211A (en) * | 2007-03-22 | 2010-02-03 | 禾逊专业化学公司 | Low temperature coated particles for use as proppants or in gravel packs, methods for making and using the same |
| CN109897617A (en) * | 2019-04-23 | 2019-06-18 | 杭州攻守道贸易有限公司 | A kind of high-efficiency oil well paraffin remover |
| CN111253970A (en) * | 2020-04-24 | 2020-06-09 | 西南石油大学 | Based on CO2/N2Preparation method of paraffin particles of switch emulsion and application of paraffin particles |
| CN111303643A (en) * | 2020-02-22 | 2020-06-19 | 西南石油大学 | SiO of core-shell structure2@ paraffin nanoparticle and preparation method thereof |
-
2021
- 2021-08-20 CN CN202110961283.6A patent/CN113653467A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101641211A (en) * | 2007-03-22 | 2010-02-03 | 禾逊专业化学公司 | Low temperature coated particles for use as proppants or in gravel packs, methods for making and using the same |
| CN109897617A (en) * | 2019-04-23 | 2019-06-18 | 杭州攻守道贸易有限公司 | A kind of high-efficiency oil well paraffin remover |
| CN111303643A (en) * | 2020-02-22 | 2020-06-19 | 西南石油大学 | SiO of core-shell structure2@ paraffin nanoparticle and preparation method thereof |
| CN111253970A (en) * | 2020-04-24 | 2020-06-09 | 西南石油大学 | Based on CO2/N2Preparation method of paraffin particles of switch emulsion and application of paraffin particles |
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